Sentence Case vs Title Case: Which Should You Use? (With Style Guide Rules)

Key Takeaways

• Sentence case is simpler, easier to read and increasingly popular in apps and websites.
• Title case looks more formal but its rules vary between style guides.
• APA, AP and Chicago disagree on small words such as "with", "from" and "between".
• The most important rule is consistency across your whole site or document.
• A case converter saves time and removes guesswork.

What Is Sentence Case?

In sentence case, you capitalise a heading exactly as you would a normal sentence: the first word, plus any proper nouns and acronyms.

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Sentence case is used widely by tech companies, design systems and news sites because it reads naturally and avoids debates about which words to capitalise.

What Is Title Case?

In title case, you capitalise the first word, the last word and all "major" words: nouns, verbs, adjectives, adverbs and pronouns. Short "minor" words such as articles (a, an, the), short conjunctions (and, but, or) and short prepositions (in, on, to) usually stay lowercase.

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Side-by-Side Comparison

Title Case Rules by Style Guide

This is why the same heading can look slightly different depending on the publication. For example, "Working with Data from Many Sources" in Chicago style becomes "Working With Data From Many Sources" in APA or AP style.

Which One Should You Use?

Use sentence case when:

• Writing buttons, menus, labels and error messages
• Writing long headings (8+ words), where title case gets hard to read
• Your brand voice is friendly and conversational
• Many people edit the same content and you want fewer mistakes

Use title case when:

• Writing book, film or article titles in citations
• Your style guide (APA, AP, Chicago) requires it
• Writing short, formal headings or product names
• You want SEO titles and headlines to stand out in a formal context

For SEO, Google does not reward either style. What matters is that your title is clear and clickable. Our meta tag generator guide covers how to write titles and descriptions that earn clicks.

Worked Examples

Notice that acronyms such as EMI and JSON stay in capitals in both styles, and "Is" is capitalised in title case because it is a verb.

How to Change Text Case Quickly

Open the Case Converter.

Paste your text.

Click Sentence case or Title Case (or UPPERCASE, lowercase and developer formats).

Check acronyms and brand names, then copy the result.

Need only one transformation? Use the dedicated Uppercase Converter or Lowercase Converter. For a full walkthrough of every case type, see how to convert text case online, and for developer formats like camelCase and snake_case, read our case converter tool guide.

A Quick Title Case Checklist

Before you publish a headline in title case, run through these five checks:

• Is the first word capitalised? It always should be.
• Is the last word capitalised? Most style guides say yes, even if it is a short word.
• Are nouns, verbs, adjectives, adverbs and pronouns capitalised? Remember that short verbs like "Is" and "Be" still count.
• Are articles (a, an, the), short conjunctions (and, but, or) and short prepositions (in, on, of) lowercase in the middle?
• Is the word after a colon capitalised? In most styles it is.

If you follow a specific style guide, check its rules for prepositions: some lowercase all of them, others capitalise any preposition of four or five letters or more.

Common Mistakes to Avoid

• Mixing styles on the same page. Choose one and apply it everywhere.
• Capitalising every word. "The" and "Of" in the middle of a title look wrong in every style guide.
• Lowercasing acronyms and brand names. Keep SEO, PDF, iPhone and EasifyMe as they are.
• Typing headings in ALL CAPS. It reduces readability and can feel like shouting.

Frequently Asked Questions

Is sentence case or title case better for blog headings?

Both work. Sentence case is easier to read and more common in modern blogs; title case feels more formal. Consistency matters more than the choice.

Should "is" be capitalised in title case?

Yes. "Is" is a verb, and verbs are capitalised in title case regardless of length.

Are prepositions capitalised in title case?

Short prepositions stay lowercase. APA and AP capitalise prepositions of four or more letters; Chicago lowercases all prepositions.

Does title case affect SEO?

Not directly. It can affect click-through rate by making titles easier or harder to scan, so test what works for your audience.

Can I convert a whole document at once?

Yes. Paste any length of text into the Case Converter and convert it in one click. Browse more free text tools for counting, comparing and formatting text.

What is the difference between title case and capital case?

Capital case (sometimes called start case) capitalises every word, including "a", "and" and "of". Title case follows style rules and keeps short minor words lowercase in the middle of a title.

Should email subject lines use title case or sentence case?

Either works, but sentence case often reads as more personal and conversational, which suits most marketing and work emails. Whatever you choose, use it consistently across your campaigns.